在考研英语中，掌握一些复杂的长句对于提升阅读理解和写作能力至关重要。以下是一些考研英语中常见的必备长句结构：
1. 非限制性定语从句引导的长句，如："The book, which has been widely praised by critics, offers valuable insights into the subject."
2. 并列句结构，如："Not only does the experiment show a significant improvement, but it also reveals new methods for achieving the same results."
3. 含有插入语的复杂句，如："Although it was raining heavily, the enthusiastic crowd still gathered to support the athlete, who had trained tirelessly for months."
4. 使用分词短语作状语的长句，如："Having finished his homework, he decided to take a short walk before dinner."
5. 涉及多个从句的复合句，如："It is believed that the new policy, which aims to reduce carbon emissions, will greatly benefit the environment and the economy in the long run."
6. 混合使用多种从句和并列句，如："The professor explained that while the theory was interesting, it was also complex and required further research to be fully understood."
7. 含有多个动词和介词短语的长句，如："The company, which has been in business for over a century, has expanded its operations to include not only manufacturing but also distribution and customer service."
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